As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT CREW SAID HE GOT CABIN ALT WARING AND THE A/C WAS NOT PRESSURIZING. HE THEN DECLARED AN EMERGENCY AND RETURNED TO FIELD AND ON THE WAY DOWN AT ABOUT 2000 FT THE A/C STARTED TO PRESSURIZE. WHILE ON GND THEY GOT RT ENG OIL PRESSURE WARNING MSG THE CREW SHUT DOWN THE ENG. MAINTENANCE R&R OIL PRESSURE SWITCH. OPS CHECK GOOD. PRESSURIZED THE A/C. OPS CHECK GOOD.